https://blog.csdn.net/u011310942/article/details/39320097
项目开启的Activity越多,占的内存越多,我们是不是有时候想当我打开很多界面的时候,我们到底打开多少个Activity,OK现在你的难题解决了,只有把这个Activity管理类复制到你的项目当中,随时随地管理的你的Activity,让你成为内存的主导者!不要问我叫什么,请叫我雷锋!首先看看效果图:
代码献上:
- /**
- * 2014-6-7 上午10:40:16
- */
- package com.jiub.client.mobile.manager;
- import java.util.Stack;
- import android.app.Activity;
- import com.jiub.client.mobile.utils.QLog;
- /**
- * @author zqy
- *
- *
- */
- public class ScreenManager {
- private final static String TAG=ScreenManager.class.getSimpleName();
- private static Stack<Activity> activityStack;
- private static ScreenManager instance;
- public static ScreenManager getScreenManager(){
- if (instance == null) {
- instance = new ScreenManager();
- }
- QLog.i(TAG, "ScreenManager create");
- return instance;
- }
- /**
- * 从栈中移除最后一个元�?
- */
- public void popActivity(){
- Activity activity = currentActivity();
- if (activity != null) {
- if (!activity.isFinishing()) {
- activity.finish();
- }
- activityStack.removeElement(activity);
- activity = null;
- }
- QLog.i(TAG, "ScreenManager popActivity ");
- }
- /**
- * 从栈中移除指定的元素
- * @param activity
- */
- public void popActivity(Activity activity){
- if (activity != null) {
- QLog.i(TAG, "要删除"+activity.getClass().getSimpleName());
- if (!activity.isFinishing()) {
- activity.finish();
- QLog.i(TAG, activity.getClass().getSimpleName()+"正在关闭");
- }else{
- QLog.i(TAG, activity.getClass().getSimpleName()+"已经关闭");
- }
- activityStack.removeElement(activity);
- QLog.i(TAG, activity.getClass().getSimpleName()+"从栈中移除");
- activity = null;
- }
- int size=activityStack.size();
- QLog.i(TAG, "删除后个数"+size);
- }
- /**
- * 将新元素添加到栈中
- * @param activity
- */
- public void pushActivity(Activity activity){
- if (activityStack == null) {
- activityStack = new Stack<Activity>();
- }
- activityStack.addElement(activity);
- QLog.i(TAG, "加入"+activity.getClass().getSimpleName());
- int size=activityStack.size();
- QLog.i(TAG, "添加后个数"+size);
- }
- /**
- * 获取栈顶元素
- * @return
- */
- public Activity currentActivity(){
- Activity activity = null;
- try {
- activity = activityStack.lastElement();
- } catch (Exception e) {
- }
- return activity;
- }
- /**
- * 移除全部元素,除了指定类型的以外
- * @param cls
- */
- public void popAllActivityExceptOne(Class<?> cls){
- int size = activityStack.size();
- for (int i = 0; i < size; i++) {
- Activity activity = activityStack.get(i);
- if (activity != null && activity.getClass().equals(cls)) {
- }else{
- popActivity(activity);
- size--;
- i--;
- }
- }
- }
- /**
- * 按照给定的Class,结束一个Activity
- * @param cls
- */
- public void finishActivityByClass(Class<?> cls){
- int size = activityStack.size();
- for (int i = 0; i < size; i++) {
- Activity activity = activityStack.get(i);
- if (activity != null && activity.getClass().equals(cls)) {
- popActivity(activity);
- size--;
- i--;
- }
- }
- }
- }
最后在Activity onCreate方法中写上三行的代码:
- protected ScreenManager mScreenManager;//初始化
- mScreenManager = ScreenManager.getScreenManager();
- mScreenManager.pushActivity(this);
- mScreenManager.popActivity(this);